Disk grinder.



F. E. GARDNER.

DISK GRINDER.

APPLICATION FILED IIIAI'LIQIS.

Patented Dee. 1916.

2 SHEETS-SHEET I.

eaefc E. G11/rainer.

F. E. GARDNER.

msx Gamm-zn,

Patented Dec. 5, N16.

2 SHEETS-SHEET 2 u Lv. DI

P i V f i 1 with respect to the weight Q9. This means comprises a bearing clocki- 31l niojfably mounted in an opening in the i-afeight 29 andhzwng un arcuate 'ce adapted to bear against the pedestal 33. A bolt 86' passes through the bearing block and is threaded in the weightV 29, the head of the bolt overlying the bearing bloclr so that when the bolt is rotated the block will be tightly jammed against the pedestal 33.

A collar 37 surrounds the pedestal above the weight 29 and has a key lying n a slot 38 in the pedestal, so that it isnon-rotatable with respect thereto, butfis capable of relative vertical adjustment 'so as to li'e at all times on the top of the weight 29. This col- `lar has a series of suitable graduation marks 39 thereon tocoperate with a inarlr 40 on the weight, so that the angle to which the pedestal 33 may be turned inthe weight is conveniently indicated. 1n addition to the adjustment of the work-tableaiordcd oy vertically moving and by rotating the pedestal in its support, `the work-table may be adjusted toward and from the grinding wheel l'by sliding the trunnons 8O in their bearings. When the table has beenadjusted to the desired position, the shaft 8O may be secured against sliding movement by means oft nfthrust collar 30 and a collar 30 fixed.

upon the shaft at opposite sides of the bear- By extending the base and providing the forward bea-ring 28 to support the forward end of the trunnion or shaft .30, a. very marked improvement in the accuracy of the nachine is attained. In rior disk grinders` the rear end only of tie shaft was supported, and the Tv'orlr-table was mounted on a relativ-ely short sleeve or bearing which surrounded the shaft and was rotatable thereon. -fi In Such a 'construction it is inipossib1+.=, tol prevent slight springing of the forward end of the shaft and it is also imi 'the tension oftheLs Jring. When the'crank 'handle and collar' 5' a'erigdly connected possible to` prevent 4play ofthe short su1i porting sleeve or bearing on the shaft, and

)een .of these movements are fatal to nice- V.accuracy of work, because the movements are much exaggerated 41n the plane of the top of the worletable where the .work is sup# ported. In the present machine, the shaft is mounted in two bearings whichl arespeced a material distance apart and the shaftitse'lf is arranged to rotate 4in thev bearings; the' work-table being'rigidly fixed to the shaft so that both of the objectionable forms of looseness or movement above mentioned are com; pletely eliminated. Furthermore, a con,

struction is p1oduced'-which will stand up the upper end of the pedestal 33. The base' 65 coinprisesa bottom plate7 and side walls 46 to move the'table top 49: A-looped handle72 lsite of .the base '15 for horizontal sldm movement toward and away from the grin 'flange 63 extending base45, which,-

and end Iwills 47 and 48 rising from the edges thereof, thus providing a hollow housin A table-top 49 is mounted on the upper ingy wheel, the table being guided by suitable means such as outstanding flanges 50 on 'the upper edge of the side walls 46 which are engaged by de endng'ilanges 5l 'on vthe top,lthe latter engage beneath 'thejfhin'ges- 50. The upper face of the top isrprovided with aplurality 'of undercutA or T slots 53 adapted to receive bolts for 'securing various work-su porting fixtures (not shown) vto :the table.; he lower side of the table is provided with a downwardly projectin rotatably mounted one end of u. shaft which shaft is additionally supported in a slee've 5G screwlthreuded in a bearing 57 in anges carrying plates 52 to,

lug 54 located interino. diate the ends o the table. 'In this lug isV 58 and between this shoulder and the lug irpostioned a ball bearing [59.v Aoollar .surrounds the shaft 55 adjacent to theinn'er end of the screw-threaded sleeve .56 .and be'-V tween the collar and the end of the sleeve is positioned' a ball bearing 6l. coiled compression spring 62. surrounds the shaft 55 and bears at one lend against the collar 60 and at its other end against .this lug 54; the latter preferablyhavng an annuler into the end vof the spring'.4

' crank handle 64 .is rigidly li'xed on the A strong 'screw-threaded sleeve 56, and e col-lar 65 is fixed .on the outer end. vof the-'shaft' 55'. A boltGG isprovidedffor rigidly connecting thecollar'and er'alnk handle, if

lVhen the'two are not connected, rota "n of the crank handle'will serve. torotatethe sleeve 56 and compress' the sprin 62. This isdone only when Vit is desire to adjust-j4 the bolt 66, rotation the crank-hdle will simultaneously rotatethe shaft 55v Vand the sleeve 5d' as n 'ri'gidunit Wththe result the grinding wheel b thescrew sleeye'; In this-movement, the boerin 59 acts as l thrust bearing between the sioulderfon the shaftV and the lug 54 o n the table to A transverse shaft' is mountedin r-r ings 68 in the rearend of the side wallei and has txed thereonv within the base a'pin ion 69' `which meshes with a short rack ber 2'0 fixed to thev underside of the table top 49,?

is mounted uponthe outer-end ofthe shaft ('37 and is adapted' to Vbe grasped by theleft handofthe operator facing the machine for '-.cranlr' handle: -and collar' to be free 'fand thus' moves the table-top 49 away from` larid'lef. Thepiece of Work is thenplaced from each other, and further assuming that it sdesired to placca new'piece 'of `Work on the table for grind i ng,.th e hand levenlA issu-'ung down, which rotates the pinion. 69.

the grinding wheel. In' this movement. 'of

the' top, thelug 54 compresses -thefspring 62" an.d 'slides the shaft in the lsleeve 56, thei'collar moving awayiirom the crank in.the"iixture (not shown) on. the tabletop,

'andfthe'handlever 71 is then permitted to rise'toallow the spring to move thetable top so as to carry the' work thereon spring thus furnishes the. grinding pressure, or, if desired,- it maybe supplemented by the operatorpushing directl)7 upon the. 1 'ear' end of the 'table-top or raisingl thehand lever '7l to press .the top toward the grinding Wheel through the medium o'f-tlie'pi1iion .(39 and' rack -70. In prior Adisk grinders, the grinding pressure ii/ as furnished entirely by the workmen pressing the uforlcagainst the' i'vheel, 'and this is -very hard andftiresome work. The present-invention relieves a-o 31 s ing wheel 15 or. the world the'operntor of'all o ra'lmrtion ofthis labor.

j On the side of the table-top. 49, next to the operator, isa. depending'v lug (Fig. locatedicilitside of the tablebase and in .thisy lug is.; threaded a 'ijnicrorneter screw 74;-

arianged to" coperate-'wjith' 'a stationary in- 4 licator.blade 75. figiedto the lng, the forward end-'fof said 'screw beingvadnpte'd toahnt .against a. stopbn Itho-base 4.5 tolimit the forward movement-of' the' tabletop.

'.Tlie'ront portion or extensionllf' of the "b isjshaped tnprovide' a basinSO adopted i `t ugh sin' outlet-'81 from .the lower p or- -t'l'on o'Ifthc-l'iood 'or-housing 16 surrounding the. .gri niling wheel.'v The extensionor base 'also provided, :it the side opposite that x `retire;'operator' etands,l with Walls. 82 lipted to receive a re! ceptz'icle 18?, into; nlxich'thc' 'Water from. the -l-la". 8'() .finireV throntrh ai pasen-gein 'the tncle- .Hi-i znaybe a sh u ian'p icinic'dwith .handles S5 th'ut it .is adapted tobchorzontally-withf dra-Wnfrorn lthe.iiluglosi..r.l' walls tol per- Init of-Iem-ptying the-' Huid" therein-oni and p rovid'ing'a supply of fresh Huid.

-Means is provided 'for (.lralwingiluid from the-.pan E53-*und forcing itagainst tliegr-indn .This -means comprisesa pump 86 of anyfprcferredcoristruction, providedwith a'pulley '87 which into' engagement with the grinding wheel. The

iserranged tfo'be belted'toapulley 88-2ed- 0n the vmein arbor 12J The inletto the purnpjis connected to apipe 89=.and4 the'end of this 4pipe lis` connected by af removable 'coupling' 90 .to an angular pipe 91fii'hich pnsseej'downthrough the top -wall "89, Aand into Ithe receptacle 83, the lower' end Aof 'the pipe haring a strainer -92 thereo'jnt'o prevent sedimentand foreign' linntter' frein being drawn into fthe pipe( The coiipling 90 isv provided'for the purpose of perlnittingthe pipe sectionV 91to'be detached find4 raised 'outl -of the'way to permit withdrawnlof the receptacle 83. The outlet from the pump 86 is vconnected by'a pipe93 with a nozzle 94' located in frontl of-the grindingr Wheel and 'adapted to-direct a strar'n'o'f fluid against thel wheel or. against'theivorlt'fas'.. desired. The n'ozzleis preferablypryided l with a shut-olli cock- 95. For the sake' of' appearance, the pipes 89 and 93 are prefer`- ably. inclose'd Within the base as. fara's'possible. It .will be Seen that the same fluid is .used o ver and over again and passes in nconl tinnous o1 circuit'ous path andthat the fluidsupplying means is embodied :is n 'nnitgiry part ofthe machine. :The receptacle 83 is made removable sow-that. a fresh supply: of fluidv may be conveniently. proiided at 'suitable intervals.' The granular materialworn off -in the grinding operation collectisfin the AbasinBO and .niiiybeconveniently scral'ied therefrom,`since the basin is'lownt one's'ide and shallow. The-outletj-piissafreji isf lof" .cated/at seine -ili's'tijncef-foin'ar( lfrenifthe plane' of .the outlet Si "from the hoiljsing for thegrindingwlieel. l Froin.v th'e foregoing. it \vi ll' be -gi'pparent that I hoveprog'lleeda--muchi'newhich' i's'; Y rnorefaccurate and dura-ble'zind is alsdeasier 'on'..th e.Workman andunoie agreeal'ile fo oper- -ate'thaninachinesof the priorv art.'

.I'clnirn as my inventiontw.

l.. disk grinderliaiiinglgin combination, a baise, a grinding wheel mounted' the 'ii-n, 110 'two bearingslocnted a. substantial distance apart, 'arocken-member ilon'ifp'risihfn" nf shnft having its'ends mounted in saidbg-laringe4 and a" central depending.' counterweight located between the bearings andrb elovrfthe' 'axisof tl1e-'sh;: 1ft, afworlr-talile; 'ioe'itionedin -f'ro'nt off'saiddriving ivhrchjixnd' ai' pedesinl'supporting' the Wmv'k-t.= i lllcgat. its uff .end and "iferticnlly ad jiist'ably' mounte 'suii-l-roclna-i.' in einlier. A' 'grinding-machine haring, in coin nation, a rotary grindingivhcel, a :ivo table located in front ofthe' wheel an" prising agbusc, n t'op slilalilen the-b Award. and'awnyff'gnm thel wheel,.afspr tending to move'. the top toward the wheel', and means `foi' -1noving the, top' nwayfromf the wheel against the vaction of saidsprng. f '3..A grinding machine hai/jing, incombi' nation,l a' grinding wheel, -a Work-tahlecomprising a base, a member slidable with-relao tion tothe hase toward and awayr from said wheel, means tending to move said member toward the Wheel, and means for moving the' member away from thevheel in opposition to/the first mentioned means.

- et. A grinding'machne having, in'combi* nation,'a rotary grinding wheel, a worktable mounted in' front of the1 ivheel and comprising a base, a nfoi'ksupport slidable thereon toward and away from said wheel, and a coiled compression spring tendin to move said Worksiippo'rt toward ,the grinding Wheel.

5. A. grinding machine having, in combination, a work'table-comprising a base, a

top slidable thereon and having :rdepending l lug, and a coiled compression spring moiinted within the base and beneath said top and bearing at one end against said lug, the other end of said spring bearing against a part'on the-base.

. 6. A grinding machine having, in combi' nationl a work-table comprising a base, a

work-siipport slidable thereon, a. spring tending to move said work support in one direction, a rack fixed with relation to said siiport, a pinion moiintedin said base and mes ing with said iack,'and'1neai is for r0- tating said pinion to move said support in the opposite direction againsbthe action of said s ring.

7.v grinding machine having, in combi nation, a work-tablegconiprising a lbase, a work-support slidahle thereon, a shaft rotatablyl mounted at one end in said support, a' sleeve'screviflthreaded in the base and vin which the otherend of said shaft is rotatably mountedfa coiled com ression. spring su'rroundinglsaid shaft and earing at one end against 'seidsupporn said sleevefbein operatively associated with the opposite en Y sli ft being oiig'itudinal'lyl vslidable iii-said sleeve when the jsprin is'jcompressed, a

2"" llaron' thef-oiiti" en of said shaft ar.-

'ranged` to 'limit the s ring-caused movement -of-.tl'ie shiit, the s aft and said sleeve being arranged to be T rigidly' connected` together,=and means for rotating saids'leeve land shaft to effect a 'screw feedof saidwork support with, reference tothe base.

' 8. A grinding machine having, in combi.' .-nation, 'a grindingfwheel, a work-table comprising a base, e work-support slid'able thereon, a'iaclandpinion connection between the base and thework support, a lever for aetiiating the rack and pinion to move the work support 'toward and away from the-grinding wheel, a screw carried bythe base, a crank on the sereni' an'd a disenigor-,ssii

vgageable connection between the work support'and the screw.

9. A grinding machine having, in'combinatioi'i,-a Work-table comprising ii base, a

work support slidable thereon, a shaft rotatably mounted at one end in` said support, a sleeve ,screwthreaded 'in-the .base'and in which the other"end ,of said shaft is rotatably mounted, a spring bearing at one end aga-inst said support,V said sleeve being opl ei'atively vassociated 'with `the opposite end of the spring to forman abutment-for the spring, means 'to limitth'ef aetioxifof theA 'spring,rthe shaft and saidisleeve being-ari ranged tobe rigidly coniiected'togetheifand 'a crank 4on the sleeve Afor-rotating the sleeve.

' 10. A' grinding machine liaving,iin conl bination, a grinding jivheel', a work-table comprising a base a'work support slidable thereon, a spring or movinglthe work su port towaidthe grinding- Wheel, a rack-an pinion connection betweenithe base and the work support, a leveroi actuating the rack and pinion to move Vthe 'worksiipport tol ried by the base, a crankV en the screw, and means for connectngthe work support `to the screw whereby rotation ofthe ,screw will positively move the ivork'support` f 11. Agrintling inachiiiezhaving, in coinbinaticn, a rotary gi'indingiyheel, a worin table "comprising a base', a 'vvi'k support slidabler thereon, a spring' tending 'to ino ve said 'work support toward. the grinding port, a pinion ino'iintedQinlsad base and meshing with said. raelnjy hand lever for rotating said pinion to n iovcsaid suppoit toward and away '.fiointl'ie 'grinding wheel.

-12.,i\'1 disk grinder ]iaifing, combinw. grinding wheel niii'iiinted* tion, a' base, a thereon, tivo bearings loeatedfaY substantial distance fapai-t, a rocher member v compris-v ing a'shaft having itseiids rotatably mount 'ed in saidfbearings, anda central depending eoiinterweight located betweenV the bearings and beltmijA the axis of the'shaft, -s'ad'rocker member, having I .an opening, therethrough extending transverselybf 'the '1 airis of said shaft, 'a' pedestal nionnteding-saidf opening f or rotation and for-longitudinal' Inovenient f transversely' yof .the anis "of -the shat,' andA a Work-table on. the upperl 'endof 'the pedestal,"

In testimony wherefj lhei'eiinto -set 'my hand in' theprese'nce of-.tivo witnesses.

l' FREDERIQIE. GARDNER. A Inthe presence of Y f 'Mimo Sacri,

Yan Waii'r.-

' wheel, a rack fixed with relation to 'said Slipsa ward and. away Vfromv the grinding ovheel" and for compressing the'spring, av screw car- 

